Electrical connection block



March 15, 1938. H. J. BLAKESLEE ELECTRICAL CONNECTION BLOCK Filed Jan. 14, 1937 IMM/Mam, mawwew 'may Patented Mar. 15, 1938 UNITED s'm'res PATENT OFFHQE 5 Claims.

This invention relates to those blocks that are designed to be interposed between the terminals of electric circuits, which have means for opening the circuits for testing and similar purposes.

The object of the invention is the production of a block which is compact, has few parts which are cheap to manufacture and assemble, and which can be easily and quickly manipulated for opening and closing the circuit across the block, and more particularly a block of this character which is so constructed that it is very easy to eciently secure the terminals of the circuit Wires.

In the embodiment of the invention illustrated this object is attained by providing an insulating base with a permanently xed threaded post upon which is a nut arranged to secure the post to the base, a nut adapted to clamp the terminal of a circuit to the securing nut, and a nut adapted to be turned into and out of contact with a conducting plate that is xed to the block. The plate has a forked end with an opening of such shape that a looped circuit terminal may be easily passed into it, and located about the post, and of such size that the terminal clamping nut may be easily reached and manipulated through the opening when the conducting plate is secured in place. The contact nut is of such size that when screwed down the post it will bind against the plate and complete the electrical connection between thev post and the plate.

Fig. 1 of the accompanying drawing shows a plan of a single line block which embodies the invention.

Fig. 2 shows a plan with the contact nut omitted.

Fig. 3 is a section on the plane indicated by the dotted line 33 on Fig. 1.

Fig. 4 is a section on the plane indicated by the dotted line 4 4 on Fig. l.

Fig. 5 is a View of the conducting plate.

The base I of the block may be made of any suitable insulating material, preferably porcelain. In the construction illustrated a conducting plate 2 is secured to the face of the base by a `screw 3. One end of the plate shown is provided with a screw 4 by means of which the terminal of a circuit may be secured. The other end of the plate is forked, having a circular opening 5 with a slot 6 opening thereto. A threaded post 'I passes from the bottom up through the base and opening in the plate and is permanently secured to the base by a nut 8 which is screwed down the post to the bottom of a recess 9 in the base. On the post in the recess 9 is a nut I0 of a size that allows it to pass through the circular opening in the plate and be screwed down the post to clamp a circuit terminal between it and the nut that secures the post in place. This nut I0 may be, and preferably is, designed to be turned up or down by a socket wrench. On the post above the plate is a nut II. The diameter of the bottom of this nut II is greater than the circular open ing in the plate so that when the nut is screwed down it will contact with the plate, and when it is screwed up it will disconnect the post from the plate.

When the block is located in place of use with the conducting plate 2 secured thereto, one line terminal may be connected to the plate 2 by the screw 4. The contact nut II and the terminal clamping nut I0 are removed. A line terminal may then be looped around the post and passed down against the nut 3 which holds the post in place, this being permitted by reason of the notched or forked end of the plate. The nut I 0 is then screwed down so as to clamp the terminal securely between it and the post holding nut 8. Finally the contact nut II is screwed upon the post.

This simple construction enables a secure and efficient electrical connection to be easily made between the terminal and the post without disturbing the conducting plate. If it is desired to change a circuit terminal or should for any reason a new terminal be required, the two nuts I0 and I I may be removed from the post and the 01d terminal removed and the new terminal placed in position and secured as described, thus permitting an efficient connection of the terminal without disturbing the conducting plate.

The invention claimed is:

l. An electrical connection block comprising a base, a conducting plate secured to the base, said plate having a circular opening and a slot openl ing thereto, a threaded post extending forward from the front of the base through said opening in the plate without contact with the walls thereof, a nut threaded on the post on the front side of the base for securing said post to the base, a

through said opening in the plate Without contact with the walls thereof, a nut threaded on the post on the front side of the base for securing said post to the base, a nut threaded on the post in front of said securing nut and back of the plate, for clamping a circuit terminal to said securing nut, and a nut threaded on the post in front of the plate for electrically connecting and disconnecting the post and the conducting plate.

3. An electrical connection block comprising a base, a conducting plate secured to the base, said plate having a circular opening and a slot opening thereto, a threaded post extending forward from the front of the base through said opening in the plate Without contact with the Walls thereof, a nut threaded on the post on the front side of the base and back of the plate, for clamping a circuit terminal to the post, and a nut threaded on the post in front of the plate for electrically connecting and disconnecting the post and the conducting plate.

4. An electrical connection block comprising a base, a conducting plate secured to the front of the base, said plate having means for the attachment of a circuit terminal at one end and a forked opening at the other end, a threaded post secured to the base and extending forward from the front thereof through the forked opening in the plate without Contact With the Walls of said opening, said post cn the front of the base having a nut threaded thereon beneath the forked opening in the plate for detachably securing a circuit terminal to the post and on the front of 'the base having a nut threaded thereon above the forked opening in the plate for electrically connecting and disconnecting the post and plate.

5. An electrical connection block comprising a base having a recess therein, a conducting plate secured to the base, said plate having a forked end extending over said recess, a threaded post extending from the base through said recess and the forked end of the plate Without contact therewith, a nut threaded on the post at the bottom of said recess for securing said post to the base, a nut threaded on the post in said recess for clamping a circuit terminal to the post securing nut, and a nut threaded on the post for electrically connecting and disconnecting the post and the forked end of the conducting plate.

HENRY J. BLAKESLEE. 

